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  • Electrical transport and grain growth in solution-cast, chloride-terminated cadmium selenide nanocrystal thin films.

Electrical transport and grain growth in solution-cast, chloride-terminated cadmium selenide nanocrystal thin films.

ACS nano (2014-06-25)
Zachariah M Norman, Nicholas C Anderson, Jonathan S Owen
ABSTRACT

We report the evolution of electrical transport and grain size during the sintering of thin films spin-cast from soluble phosphine and amine-bound, chloride-terminated cadmium selenide nanocrystals. Sintering of the nanocrystals occurs in three distinct stages as the annealing temperature is increased: (1) reversible desorption of the organic ligands (≤150 °C), (2) irreversible particle fusion (200-300 °C), and (3) ripening of the grains to >5 nm domains (>200 °C). Grain growth occurs at 200 °C in films with 8 atom % Cl(-), while films with 3 atom % Cl(-) resist growth until 300 °C. Fused nanocrystalline thin films (grain size = 4.5-5.5 nm) on thermally grown silicon dioxide gate dielectrics produce field-effect transistors with electron mobilities as high as 25 cm(2)/(Vs) and on/off ratios of 10(5) with less than 0.5 V hysteresis in threshold voltage without the addition of indium.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Chlorotrimethylsilane, puriss., ≥99.0% (GC)
Sigma-Aldrich
Chlorotrimethylsilane, produced by Wacker Chemie AG, Burghausen, Germany, ≥99.0% (GC)
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Chlorotrimethylsilane, purified by redistillation, ≥99%
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Tributylphosphine, ≥93.5% (Tri-N-butylphosphine, GC)
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Tributylphosphine, mixture of isomers, 97%
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Chlorotrimethylsilane, ≥98.0% (GC)
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Butylamine, 99.5%
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Butylamine, ≥99%
Supelco
Butylamine, analytical standard
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Chlorotrimethylsilane, for GC derivatization, LiChropur, ≥99.0% (GC)
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Tri-n-butylphosphine, 97%
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Benzene-D6, 99 atom % D
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Methyl acetate, ≥98%, FG
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Methyl acetate, anhydrous, 99.5%
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Tributylphosphine solution, 200 mM (in N-methyl-2-pyrrolidinone), liquid
Supelco
Methyl acetate, analytical standard
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Benzene-D6, "100%", 99.96 atom % D
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Chlorotrimethylsilane solution, 1.0 M in THF
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Benzene-D6, 99.6 atom % D
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Benzene-D6, 99.6 atom % D, contains 0.03 % (v/v) TMS
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Benzene-D6, anhydrous, ≥99.6 atom % D
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Methyl acetate, natural, 98%, FG
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Methyl acetate, ReagentPlus®, 99%
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Methyl acetate, suitable for HPLC, ≥99.8%
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Tri-n-butylphosphine, 99%